Lighting unit



FIG. 1 is a front elevational view of a lighting unit according to my design, the rear elevational view being a mirror image thereof;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevational view, the left side elevational view being a mirror image thereof; and,

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a lighting unit, as shown and described. 